Episodes 1-5 of the fantasy anime series. A man wakes up from a nightmare staring at an unfamiliar ceiling. A beautiful girl, who introduces herself as Eruruu, is tending to his wounds. He has no memories of his past, and doesn't know who he is, or was. Furthermore, he is wearing a strange mask that he can't take off. After being assured about his whereabouts by Eruruu, he starts a new life and starts to mix with the locals. But this peaceful existence doesn't last - something within the woods seems to be threatening the villagers' everyday lives.